Kindly Note: If you want both earbuds blutooth pairing with your phone at the same time, plz follow these steps: 1) Turn on the bluetooth of your smart phone. 2) Turn on both earbuds together, and double-click the button of one earbud. 3) Pairing with the bluetooth, then both earbuds could be pired at the same time. Features: 1. listening to the song correct, support songs and call, 2. remind call number, the last call back, all intelligent Chinese and English voice prompts, boot, pair, shut down the phone power will be low voice prompts; 3. Power capacity will show on your Iphone, you can see the power situation anytime, do not worry about the electricity ,make your life without worry; 4. One to two connections, can be connected to two mobile phones at the same time 5. Bluetooth headset connected to the phone after the shutdown , and then open the Bluetooth headset will connect back to the phone automatically , more convenient; 6. Intelligent compatibility: support all Bluetooth mobile phone, tablet, notebook, singing it, QQ music, movies, etc., universal all mobile phone Specification: 1. Driver: 15mm 2. Impedance: 32 OHM 3. Bluetooth versioerating voltage range: 3.0V-4.2V 10. Mic sensitivity: -42dB 11. With A2DP / AVRCP high quality stereo audio transmission and remote control protocol 12. Powerful noise de-noising circuitn: Bluetooth v4.2 + EDR 4. Bluetooth use band: 2.4GHz 5. Power level: CLASS II 6. Output power: 30mW 7. Bluetooth distance: 10 meters barrier 8. Frequency response: 20-20000Hz 9. Op (active noise reduction) 13. switch between Chinese and English (boot does not connect Bluetooth state, press the switch 2 times, hear the tone switch successfully) 13. Talk time is about 2-3 hours 14. music time about 1.5-2 hours 15. Standby time is about 100 hours Package Includes: 2 x mini Bluetooth Headphones(left and right earphones) 1 x Charging box 1 x USB Charging Cable 1 x User Manual